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INTRODUCTION
The GPS 1814 is derived from the well established and popular
GPS 1804 series of high precision time and frequency references.
It was designed to fulfill the requirements of applications
requiring a high quality professionally engineered GPS synchronised time
reference source
at significantly reduced cost, whilst not resorting to cost cutting.
Click here for
datasheet of typical
1814
variant 
1804 / 1814 Options Page
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SPECIFICATION
| SERIAL DATA INTERFACE RS232 |
| Connector 9 Way 'D' socket. |
| Two operating
modes are provided. |
| a) Terminal Mode. |
Unit powers
up in this mode. Data is formatted to directly
drive a terminal providing a continuous, rolling
display of Date, Time and satellite acquisition data. |
| b) Remote Mode. |
A range of commands is available providing comprehensive
control and interrogation of the unit's
functions and status. |
| 1 Hz OUTPUT |
Connector BNC, level TTL, leading edge on time to within ± 2 µs of UTC.
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| ALARM OUTPUT |
Provides an alarm indication in the event of loss of GPS
lock, or power supply failure. |
| Relay
Contacts |
N.C. |
|
Contact
rating |
30V 0.5A d.c. max. |
|
Delay |
User programmable, 1 sec to 18 hours. |
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Immediate alarm on power failure. |
| POWER SUPPLY |
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| Voltage |
230V ac, 45 to 66 Hz. |
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Power loading |
15VA typical. |
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Connector |
3 pin IEC, 2 m cable supplied. |
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On/Off Switch |
NONE FITTED on standard units.
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TEMPERATURE RANGE
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Rack Mount Unit. |
Aerial Assembly |
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Operating |
0 to +40°C RH 90% (non cond.) |
-40 to
+70°C RH100% |
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Storage |
-4 0 to +70°C RH 30% |
-55 to +85°C RH 30%. |
EMC
The 1814 Series is fully compliant with European
Directive 89/336/EEC,
Standards :EN 50081-1 (Emissions) :EN 50082-1 (Immunity)
DIMENSIONS
Width 483mm. Standard 19" rack mount format.
Height 43.6mm. Standard (1U).
Depth 350mm (excluding connectors).
CONSTRUCTION
Fully enclosed aluminium alloy case plated Alocrom 1000.
Front panel painted parchment white with black legends.
Note : Rack support brackets MUST be used.
Consult factory if rack slides are required.
AERIAL OPTIONS
Option 1 A weatherproof aerial assembly is supplied with each
unit.
Downleads should be ordered separately as E43 (20 metre)
or type E44 (50 metre).
Other lengths available to order.
TIMECODE OUTPUT OPTION
| Format |
IRIG B or IRIG A or XR3 (250Hz) or XR3/2137
(1KHz)
Either modulated or unmodulated (d.c. level shift) code format may be selected. |
| Selection |
The output code format may be user selected via the serial RS232 interface, or factory preset. |
| Modulated Code |
Level 4V p-p (mark), Internally
adjustable.
Modulation index Factory set 4:1 Internally adjustable.
Source Impedance 100 ohm nominal. |
Unmodulated Code
| Level |
0 - 5V (nominal) logic level CMOS / TTL compatible. |
|
Connector |
BNC on rear panel. |
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Timing Accuracy |
Timecode output within ± 2 µs of UTC |
d.c. INPUT OPTION
For external battery support. Provides the facility to connect
an external
battery support unit to maintain operation in the event of a
power failure.
A range of battery support units is available from
Rapco.
REFER TO 1804/1814
OPTIONS PAGE for additional information
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